Brake for pile-wire-controlling mechanism for looms



April 24, 1928.

W. E. SMITH BRAKE FOR FILE WIRE CONTROLLING MECHANISM FOR LOOMS 1926 2 Sheets-Sheet 1 Filed Aug. 5.

Ewe 77 60 7",

April 24, 1-928. 1,667,682

w. E. SMITH BRAKE FOR FILE WIRE CONTROLLING MECHANISM FOR LOOMS Filed Aug. 5. 1926 2 Sheets-Sheet 2 Patented Apr. 24, 1928.

* UNITED STATES] NEW JERSEY.

PATENT OFFICE. f WILLIAM EJSMITH, on M rL L'rowN, NEW masmi, ASSIGNOR To GU LBnNKIAN LESS RUG COMPANY, OFiNEW'BRUNSWICK, NEW UERsEYQ cORPOBArIOK o1 BRAKE FOR PILE-WIRE-CONTROL LING MECHANISM FOR LOOMS.

Application filed August a, 1926. Serial No. 126,899.

My invention relates to pile wire control-, ling mechanism for looms and more:part1c'u-;-

larly to the rope motion thereof, bymeans of which the pile wires are inserted into the open warp shed of the fabric being woven.

In looms employing pile wires, by means of which the cut'pile fabric is'produced, the

pile wires are successively drawn from the woven fabric by means of acontinuous1y driven chaln operatively connected to a suitable reclprocatlng carriage. The ,carriage s provided with mechanisni'adapted to engage the elements of a loom the chain, and to be released from the chainwhen the pilewire. is' entirely withdrawn from the fabric. The carriageis also provided with mechanism adapted to operatively engage thehead of eachof the pile wires.

For inserting the withdrawn pile wire into the open warp shed a rope motionis employed, having a rope connected at one of its ends to the carriage and its opposite end connected to a spirally grooved rope wheel. The rope wheel is secured to ashaft to which power is intermittently applied and released, the power being applied when it is desired to insert a pile wire and by means of which the rope wheel is revolved, subsequently winding the rope on the grooved face thereof. When'the pile wire is inserted completely, power is released from therope wheelwhich normally runs free 5 while the wire carriage is engaged by the withdrawing chain to withdraw another pilewire from the fabric. 7

Due to the fact that the rope freeto permit the rope to be unwound therefrom when the carriage is moving outward, the rope wheel gains considerable rotational momentum, and therefore a considerable amount of slack is developed in the rope. In order to reinsert the pile wire, it is necessary to first take up the slack in the rope. It is to be understood that power is applied to the rope wheel fora certain definite lengthv of time in order to insert the withdrawn wire. The amount of slack developed in the rope varies considerably, therefore, there are times when the wire is not'fully' inserted into the fabric, and there are other times when the power is not released when-the wire is fully inserted, due to the variation in. the

with the art.

. wheel runs amount of slack in the inserting rope. These conditions many, times cause stoppages of the loom, and breakage of the elements of the loom as are well known to those familiar The object of-my invention the. running of slack-in, the inserting rope. The details of my, invention. will be more fully disclosed hereinafter, reference being which is toprevent I '00 had to the accompanying drawings, of.

Fig. 1 is a front elevation'ofsufiicientgof..

trate my invention;

Fig. 2 is a transverse sectional elevationv Referringto Fig. 1, the wire controlling? carriage is illustrated at Ian-d is adapted to be reciprocated upon a rail2 suitably:

secured to the frame .of the loom. The carriage 1 is moved outward in the direction of thearrow A- by means of a continuously driven chain?) to which motion is applied by means of a continuously driven sprocket 4. The carriage 1 isprovided with mecha nism whereby the said carriage is operatively connected to the chain. 3, anda latch 5-on, the carriage 1 is'adapted to-engage a pro ect1on"6 on the rail 2, by means of which thecarriage is released from the chaindrawing motion. j a

A bracket 7 is formed on the'carriagel when itreaches the outer-end of its with-' for the reception of one end'of arope ,8

whichissuitably secured therein. -The rope Spassesaround an idler pulley, 9 rotatably mounted on the frame of the loom and thence aroundthe grooved face'lO of a spiral rope wheel 11, one end of said rope 13. The sleeve 15 is provided atone 'end with abevelled pinion 17, and at the o'pposite end with one element 18 of a friction to thoroughly illusa I clutch 18. The second element 18 of the friction clutch 18 has a hub 20 splined to the shaft 13.

Suitable mechanism is provided for caus ing operative engagement of the elements 18 and18 of the clutch 18 in timed relation with the other co-operating elements of the loom, it being understood that the bevelled gear 17, the sleeve 15 and the flanged ele ment 18 of the clutch 18 are continuously driven from a suitable source of power. The above described mechanism is common to looms on which seamless rugs are woven, and forms no part of the present invention, myinvention comprising mechanism ap pliedto the shaft 13 to prevent the development of excessive rotational momentum as .above described.

For attaining the object above referred to,

l provide-a ratchet wheel 25 having a hub 26 loosely mounted on the shaft 13 adjacent the inner end of the bearing 14. "The hub 261s provided with a planed or finished periphery 27 which is surrounded and engaged bya permanently set brake 28. The brake 28---comprises a split band comprising two semi-circular shoes 29 and 30, each having an ear-31' mounted on a pivot pin 32, which is secured in a lug 33 formed on the flange 85 of a collar 36, secured by means of set screw 37 to the shaft 13. Friction material 38-is secured to each of the shoes 29 and "30 of the brake 28, between said shoes and the plane surface 27 of the hub 26, of the ratchet wheel 25. Each of the shoes 29 and 30-is provided with lugs 39 and 40 respectively, and a bolt 41 passes through apertures formed in said lugs and extends beyond the lug 40 in the present instance. The head 42 of the bolt 41 engages the outer side of the lug 39 and a nut 43 is adapted to the opposite threaded end 44 of the bolt 41. Intermediate the lug 40 and the nut 43, a compression spring 45 is mounted, by means of which and the nut 43 any desired amount of pressure may be applied by the brake shoes '29 and 30 to the hub 26 of the ratchet wheel A pawl 46is pivoted to the frame of the loom at 47, and is adapted to engage the teeth of the ratchet wheel 25. When power is applied to the shaft 13 for the purpose of of the arrow B, Fig. 1, to insert a pile wire into the open warp shed of the fabric being woven. 7

When the wire is completely inserted, the

i of the ratchet wheel. 25.

elements 18 and 18 of the clutch 18 are disengaged and the chain 3 is then operatively connected to the carriage 1 to move said carriage in the direction of the arrow A, Fig. 1. The shaft 13, at such time, is rotated in an opposite direction, indicated by the arrow D in Fig. 3, by means of the rope 8 and the wheel 11. Rotation of the shaft 13 in this direction is'opposed by means of the pawl 46 operatively engaging the teeth of the ratchet wheel 25, thereby stopping the "rotation ofsaid wheel and the hub 26 thereof, the collar 36 being secured to the shaft 13 obviously rotates with said shaft and carries with it the brake 28 thereby developing an opposing braking force between the brake elements 2930, and the hub .26

Such operation prevents the development of excessive rotational momentum by the wheel 11 and shaft 13, and subsequently prevents slack from running in the rope 8 when the carriage 1 is released from the chain 3; The absence of slack in the rope 8 mak-es the operating le'ngth'of said rope substantially constant, therefore, the action'of the clutch v18 may be more accurately adjusted to release the carriage 1 at the proper time after a wire .is completely inserted in the warp shed of the fabric being woveninvention, various modifications will obviously present: themselves to those familiar with the'art, therefore,-only such limitations should be placed upon the scope of my invention as are prescribed, by the appended claims or dictated by the prior art-of record.

I claim:

1. In pile wire lOOIltI'OlllIlg mechanism for looms having a reciprocating carriage, a rope motion for moving rsaid'carriage inward with respect to said loom, and means for movin said carriage outward with respect to said loom, :said rope motion including a shaft adapted to berotated in a direction to move said carriage inward, and to rotate 2. In pile wire controlling mechanism for looms having a reciprocating carriage, a rope motion for moving said carriage 1nward with respect to said loom, and means for moving said carriage outward with re-- spect tosald loom, said rope motion in-v eluding. a-shaft adapted to be rotated in a direction to move said carriage inward, and to rotate freely in a reverse direction when the carriage moves outward, a brakemechanism operable by the reverse movements of Having described one embodiment of my said shaft, adapted to oppose the rotation of said shaft when the carriage is moving outward and to permit rotation of said shaft free of the said opposition when the carriage is moving inward.

3. In pile wire controlling mechanism for looms having a reciprocating carriage, a rope motion for moving said carriage inward with respect to said loom, and means for moving said carriage outward with re spect to said loom, said rope motion includ ing a shaft adapted to be rotated in a direction to move said carriage inward, and to rotate freely in a reverse direction when the carriage moves outward, means operable by the reverse movements of said shaft, adapted to oppose the rotation of said shaft when the carriage is moving outward and to permit rotation of said shaft free of the said opposition when the carriage is moving'inward comprising a brake drum carried by and adapted to rotate with said shaft when the carriage moves inward, a brake shoe carried by said shaft and adapted to frictionally engage said brake drum, and means carried by a relatively fixed portion of said loom for opposing rotation of said brake drum when the carriage is moving outward.

4:. In pile wire controlling mechanism for looms having a reciprocating carriage, a rope motion for moving said carriage inward with respect to said loom, and means for moving said carriage outward with respect to said loom, said rope motion including a shaft adapted to be rotated in a direction to move said carriage inward, and to rotate freely in a reverse direction when the carriage moves outward, means operable by the reversemovements of said shaft, adapted to oppose the rotation of said shaft when the carriage is moving outward and to permit rotation of said shaft free of the said opposition when the carriage is moving inward comprising a ratchet wheel loosely mounted on said shaft, a hub on said ratchetwheel, a brake secured to said shaft and engaging said hub, and a pawl pivoted on the frame of the loom adapted to engage the teeth of said ratchet wheel and prevent the rotation thereof when the carriage moves outward and toirideover, the teeth of said ratchet wheel when the carriage moves inward.

5. In pile wire controlling mechanism for looms having a reciprocating carriage, a rope motion for moving said carriage inward with respect'to said loom, and means for moving said'carriage outward with respect to said loom, said'rope motion including a shaft adapted to be rotated in a direction to move said carriage inward, and to rotate freely in a reverse direction when the carriage ,moves outward, means operable by the reverse movements of said shaft, adapted to oppose the rotation of said shaft when the carriage is moving outward and to permit rotation of said shaft free of the said opposition when the carriage is moving inward comprising a ratchet wheel loosely munted on said shaft, a hub on said ratchet wheel, a brake secured to said shaft comprising shoes engaging the periphery of said hub, means for regulating the frictional bearing of'the shoes on said hub, and a awl pivoted on the frame of the machine a apted to engage the teeth and prevent rotation of said ratchet wheel when the carriage is moving outwardand to ride over the teeth of said ratchet wheel when the carriage'moves inward. a

WILLIAM SMITH. 

